> I am a user of the glpk solver for solving linear programming > problems. I am at present using the tool as part of my Master's thesis > and I experienced a bug on several small example. I report one of them > to you in the report attached to this mail.
> I would be very grateful to you if you could tell me how I can > correct the bug, so that I can progress further in my work. For > example, is there another version of the tool with which the problem > would not happen? Or is there an option that I could use in order to > make things right? Please note that glpkmex is a separate project. Probably you should post your report to the bug tracker of the glpkmex project: http://sourceforge.net/projects/glpkmex/support Looking thru your bug report I found that you perform perturbation of the constraint matrix by adding 1e-15 to all its elements. It is not a good idea to perturb *zero* elements in such way, because that makes the matrix extremely badly scaled: max|aij|/min|aij| ~= 1e+15. If the automatic scaling is enabled, there may appear large round-off errors. I would suggest you either to disable the automatic scaling in this case or, that is much better, not to perturb zero elements. _______________________________________________ Bug-glpk mailing list [email protected] http://lists.gnu.org/mailman/listinfo/bug-glpk
